多轴混合动力特种车辆空气动力学特性分析与改进设计

建立某多轴混合动力特种车辆整车外流场仿真模型,采用计算流体力学方法分析整车外流场特性。根据分析结果对驾驶室进气格栅、驾驶室与货箱之间的上部连接、驾驶室下部进风口三个部位进行优化设计。在优化设计过程中,特别关注提升各车桥分布式驱动电机的散热效果,并根据局部外流场特性确定车桥处的电机风扇朝向布置。结果表明,优化后的整车风阻系数降低了6.4%,各车桥均可通过底盘底部的气流分支进行良好冷却,确保满足驱动电机的散热需求。

Aerodynamic Characteristics Analysis and Improved Design of a Multi-axis Hybrid Special Vehicle

A simulation model of the external flow field of a multi-axis hybrid special vehicle is established,and the characteristics of the external flow field of the vehicle are analyzed using the method of computational fluid dynamics.According to the analysis results,the three parts of the cab air intake grille,the upper connection between the cab and the cargo box,and the lower air intake of the cab are optimized.In the optimization design process,special attention is paid to improving the heat dissipation effect of the distributed drive motors of each axle,and the orientation of the motor fan at the axle is determined according to the local external flow field characteristics.The results show that the optimized wind resistance coefficient is reduced by 6.4%,and each axle can be cooled well by the airflow branch at the bottom of the chassis to ensure that the heat dissipation requirements of the drive motor are met.